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Broadcasting & Telecommunications Convergence Research Laboratory

HOME > R&D > Broadcasting & Telecommunications Convergence Research Laboratory > Radio Technology Department > Introduction

areas for Research & Development

Spectrum Engineering Research

The radio spectrum is a key resource for many new and developing radio-communication technology based on radio services. The management and development of the spectrum will therefore play an important role in creating a knowledge driven economy and society.

Effective and systemic usage of the spectrum in radio-communication services requires some principles and techniques for effective spectrum management, sharing criteria and methods, techniques for spectrum monitoring and long-term strategies for spectrum utilization and economic approaches to national spectrum management. To study on the above issues, Spectrum Engineering Research Team of ETRI makes an efforts to the following project :

Spectrum engineering technology
Radio-wave propagation technology
Coexistence technology for dynamic spectrum access
Broadcasting Channel assignment
Movement and rearrangement methodology for fixed and mobile radio-relay services in M/W bands

Spectrum engineering technology

Spectrum engineering technology picture 1

Radio-wave propagation technology

Radio-wave propagation technology picture 2

Broadcasting Channel assignment

Broadcasting Channel assignment picture 3

Millimeter-Wave Radio Technology Research

The spectrum engineering techniques based on dynamic spectrum access such as horizontal (underlay) and vertical (overlay) schemes have been developed in order to solve existing spectrum inefficiency problems.

Restless quests for new radio resource is now leading RF technologies towards 70/80/90 GHz, swiftly overtaking 60 GHz. Antenna/RF/IF technologies have been into research to utilize 5 GHz of available bandwidth, designated for fixed point-to-point links, in each of 70/80 GHz band. The major research fields of interest include active components such as MMIC and frequency synthesizer, passive ones such as flat-panel antenna and filters, and millimeter-wave packaging and interconnection technologies for smaller, cheaper module production.

The information transmission capacities increase 2 times every 18 months with the technological progresses in the information and communication technology(ICT). In this trend, wireless transmission capacity of above 10Gbps information rates will be required within 5 ~ 10 years. In order to realize this technical objectives, it is strongly required to analyzed the propagation environment in THz range and to develop the key technologies in the wireless communications.

In this research, in order to effectively utilize THz frequencies and to firmly establish the future information and communication infrastructures, we will develop the basic and fundamental technologies of THz wave propagation characteristics and wireless transmission systems which will be a basis of new frequency utilization paradigms.

The research areas in the THz frequencies are as follows:

Analysis of propagation environments and wave propagation chacteristics
Design of wireless communication link in the THz frequencies
Development of key components and modules for communication applications
Development of wireless transmission flatform with above 10Gbps data rate using 0.22 ~ 0.27 THz frequency range

Cognitive Radio Technology Research

Cognitive Radio is emerging technology that utilizes temporal/spatial orthogonality of the spectrum so that a secondary licensee can access the air, not causing harmful interference to the first and thus effectively increasing the utilization of scarce radio resources. The CR research of ETRI cuts across fundamental areas such as spectral sensing and adaptive transmission technologies, as well as protocols and algorithms for cognitive radio communications.

IEEE 802.22 WRAN (Wireless Regional Area Network) WG, the first international standardization effort of CR technology, was formed to tap cost-effective wireless internet access into sparsely-populated areas, utilizing temporal/geographical 'white spaces' in V/UHF bands, after the DTV transition. ETRI has been active and major part of this effort, by developing and delivering into the standard a significant set of technologies such as OFDMA transmission, channel management and channel switching protocols.

Open-ended application of CR also includes personal/portable devices running in home networks. ETRI's focuses have been on developing a group of fundamental CR technologies for personal/portable network environments such as spectral sensing, management of radio resources and data transmission.

Cognitive Radio Technology Research

Antenna Research

In wireless systems such as broadcasting, mobile and satellite communications, data information should be efficiently transferred to desired area through free space medium. Antennas are the most important component to be needed in the system for wireless communications

Up to now, many kinds of antenna have been developed and used in different wireless systems. Antennas used in cellular and wireless phone, television and direct broadcasting satellite could be easily found in real environments. For coping with rapid technical evolution of wireless systems, antenna technology has been also adaptively upgraded from fixed, simple, single, passive types to mobile, complex, array, active ones, respectively. To study key antenna technologies on these trends, Antenna Research Team of ETRI makes an efforts to the following projects Intelligent antenna technology development, Diagnosis technology research by using antenna sensing technology based on EM, Advanced antenna measurement system technology development.

Intelligent antenna technology development is to study to realize reconfigurable technologies at mobile base stations. These are the frequency reconfigurable for SDR system, the polarization reconfigurable for MIMO system, the beam-coverage reconfigurable for efficient BS operation.

Antenna Research picture 1

Diagnosis technology research based on EM is the study on breast cancer detection by microwave imaging technology which is one of IT-BT fusion technologies. The microwave imaging is using antenna sensors to detect electromagnetic waves from target to analysis its material characteristics.

Antenna Research picture 1

Antenna measurement is one key essential for antenna research. This team also makes an efforts to study advanced antenna measurement technology and its system development. The studies include the study for improving measurement performance and the other study for developing a new Fresnel zone measurement technology.

Antenna Research picture 1

For increasing the efficiency and decreasing the size of antenna, we have researched and developed metamaterials and also their applications for improving the radio spectrum characteristics of the mobile communication system, the mobile communication system. Metamaterials have unique electromagnetic properties of both negative permittivity and permeability or negative refraction index and the like.

Antenna Research picture 1

Health effects of EMF research

In order to prevent the public concern and misconception caused by electromagnetic fields (EMF), the scientific research is needed. Because the effects of EMF on the human are considered to being related to the competitiveness for product as well as regulation, the preparation of technical standards and standard measurement methods are essential to ensure the national competitiveness.

ETRI is to establish the regulation of EMF exposure limits and to propose the scientific methods for evaluation for mobile terminal and fields and induced current measurement from fixed station, In addition, biological effects of EMF are investigated quantitatively and scientifically, thus keeping the public from the health effects of EMF.

Results of the relevant guidelines will be utilized as the basic data to establish regulation for compliance test for emissions from portable and body-mounted devices and be utilized when establishing EMF policy. The study on the biological effects of the EMF exposures would contribute to determine its effects on the EMF scientifically and quantitatively.

Health effects of EMF Research

Spectrum monitoring technology research

Spectrum monitoring is a national service for protecting spectrum users from radio interference and illegal radio station, which is carried out through measurement and analysis of radio emission. Recently wireless multi-media services which require wideband and GHz frequency channels are rapidly deployed. Research and development of spectrum monitoring technologies to cover such changes of spectrum usage are very important because effective spectrum monitoring supports booming of RF industry, and national economic growth. To study on the above issues, ETRI makes an efforts to the following project :

Wideband Spectrum measurement and analysis using High-speed digital signal processing
Signal location Estimation in urban areas
Radio environment measurement and analysis
Spectrum monitoring system suitable for proximity measurement in various environments with small size and low power consumption.

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